Improvement in stove-pipes



' o. nova.

Stove-Pipes.

Patented April 21,1374.

Noll49,914.

PATENT OFFICE.

DAID BOYD, on NEW YRK, N. Y.

IMPROVEMENT Specification formin g part of Letters Patent No INSTOVE-PIPES.

. 149,914, dated April 21,1874; application filet] March 7, 1874.

T0 all whom z't may concern:

Be it .known that I, Dr. DAVID BOYD, of N ew York city, in the countyand State of New York, have invented a new and usefui Improvement inSmoke-Pipes, of Which the foi- 1owing is a specification:

The invention relates to a novel mode of constructing attachments forsmoke-pipes, as hereinafter fu1ly described, and subsequently embodiedin the means pointed out in claim Figure 1 is a side view of the outerpipe. Fig. 2 is a side view of the inner pipe. Fig. 3 is a longitudinalsection, showing the pipes combined. Fig. 4 is a cross-section of theimproved smoke pipe, showing the air-apertures, with one of the closingslides. Fig. 5 is a view showing a side view of one of the slides.

Similar letters of reference indicate corresponding parts.

A A represent the outer pipes, and B B the inner pipes, the latter beingof 1ess diameter, so that an annular fine, 0, is left between the twofor the passage 01. the smoke and heated gascons products of combustion.D is the interior of the inner pipe, being a bot-air chamber. E aretubular openings for the admission and escape of air to and from theinner pipe or air-chamber D. F represents caps for closing the ends ofthe inner pipe. Gr is a removable collar for the outer pipe. For heatingpnrposes the caps F are placed on the ends of the inner pipe B, as seenin Fig. 3, and the smoke passes up through the annular fine 0. When thepipe makes a turn, this annular fiue discharges into an elbow, 0,consisting of a single pipe, of the diameter of the inner pipes B B,connected with the outer pipes A A by means of the co1lars G, as seen inthe draw-' ing. As the air in the inner tubes becomes rarefied, cool airWill rush through the lower -opening E, and will be discharged throughnext upper opening E. There may be two or more of these openings forreceiving the air, and discharging it when it becomes expanded, as seenin the'drawing. When not required for heating, the caps F are removedfrom the inner pipe, and the openings E are covered With the slides H.The collar G is pnshed on to the bottom of the outer pipe, so that theinclined portion I will close the end of the inner pipe. The pipe beingplaced upon the collar of the stove or heater, it Will be seen thatinner pipe, leaving the outer pipe comparativeiy 0001. This arrangementis desirabie in warm weather, or when it is not necessary to utilize theheat. In cold weather, when it -is an object to utilize all the heatgenerated from the fuel, it Will be seen that the whole outer surface ofthe outer pipe, and the Whole inner surface of the inner pipe, becomeheatradiating surfaces, the one heating the air in the apartment bydirect radiation, and the other heating air to be dischargcd into theroom, thus utilizing a very large percentage, if not the whoie, of theheat generated from the fuel.

It is W611 known that in ordinary pipes and fines ascending currents ofheat seek the center, and are repelled by the cooler surface of the fineor pipe. A very large proportion of the heat generated in the ordinarymanner is, therefore, not utilized, but discharged into the chimney, andthe fuel wasted.

Instead of a central column of ascending heat, the heated gases 'arespread out into a thin layer or stratmn, and are compelled to part Withtheir heat before being discharged.

Havimg thus described 1ny invention, what I claim as new, and desire tosecure by Let tors Patent, is

. An attachment for smoke-pipes, consisting of pipes A B and A B,connected by an elbow, C, and provided With dampered openings E; theouter pipes A A, having collars G, and the inner pipes B B, having capsF, ail as and for the purpose specified.

DAVID BOYD. Witnesscs:

T. B. Mosnnn, ALEX. F. ROBERTS.

there will be a direct central draft through the Bymy improvement thisaction is preven ted.

